watchOS 6.1 (build 17S5059e) is an official Apple over-the-air update for the Apple Watch Series 1 (38mm), released on 2019-10-02T17:09:59Z. The update package is 410.43 MB. This is a delta (partial) update that requires 6.0 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 65f5d41419089809320e1d676cc63bba71868735.zip.